Editing Ammonia (section)

==== Lifting gas ====
At standard temperature and pressure, ammonia is less dense than atmosphere and has approximately 45–48% of the lifting power of hydrogen or [[helium]]. Ammonia has sometimes been used to fill balloons as a [[lifting gas]]. Because of its relatively high boiling point (compared to helium and hydrogen), ammonia could potentially be refrigerated and liquefied aboard an [[airship]] to reduce lift and add ballast (and returned to a gas to add lift and reduce ballast).<ref>{{cite book |last1=Horkheimer |first1=Donald |title=AIAA 5th ATIO and 16th Lighter-Than-Air Sys Tech. And Balloon Systems Conferences |chapter=Ammonia – A Solution for Airships Demanding Rapid Changes in Net Buoyancy |chapter-url=https://doi.org/10.2514/6.2005-7393|year=2005 |doi=10.2514/6.2005-7393 |isbn=978-1-62410-067-3 |access-date=27 October 2022}}</ref>